A platinum ring centered with a 19.14-carat emerald-cut diamond with D-color and VS1 clarity. The main stone is flanked by several baguette-shaped diamonds. Its estimate is $700,000 - $1 million.

Just seven months after Prince Rainier III of Monaco swept Grace Kelly off of her feet during a photoshoot at the Palace of ...

While we're all familiar with the more classic circular, square, emerald or oval cuts, the marquise-cut engagement ring is a ...